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80 lines
2.7 KiB
C
80 lines
2.7 KiB
C
/* Copyright (C) 1991-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _SIGNAL_H
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# error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
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#endif
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/* These definitions match those used by the 4.4 BSD kernel.
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If the operating system has a `sigaction' system call that correctly
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implements the POSIX.1 behavior, there should be a system-dependent
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version of this file that defines `struct sigaction' and the `SA_*'
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constants appropriately. */
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/* Structure describing the action to be taken when a signal arrives. */
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struct sigaction
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{
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/* Signal handler. */
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#ifdef __USE_POSIX199309
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union
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{
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/* Used if SA_SIGINFO is not set. */
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__sighandler_t sa_handler;
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/* Used if SA_SIGINFO is set. */
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void (*sa_sigaction) (int, siginfo_t *, void *);
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}
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__sigaction_handler;
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# define sa_handler __sigaction_handler.sa_handler
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# define sa_sigaction __sigaction_handler.sa_sigaction
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#else
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__sighandler_t sa_handler;
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#endif
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/* Additional set of signals to be blocked. */
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__sigset_t sa_mask;
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/* Special flags. */
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int sa_flags;
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};
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/* Bits in `sa_flags'. */
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#if defined __USE_UNIX98 || defined __USE_MISC
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# define SA_ONSTACK 0x0001 /* Take signal on signal stack. */
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#endif
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#if defined __USE_UNIX98 || defined __USE_XOPEN2K8
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# define SA_RESTART 0x0002 /* Restart syscall on signal return. */
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# define SA_NODEFER 0x0010 /* Don't automatically block the signal when
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its handler is being executed. */
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# define SA_RESETHAND 0x0004 /* Reset to SIG_DFL on entry to handler. */
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#endif
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#define SA_NOCLDSTOP 0x0008 /* Don't send SIGCHLD when children stop. */
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#ifdef __USE_MISC
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# define SA_INTERRUPT 0 /* Historical no-op ("not SA_RESTART"). */
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/* Some aliases for the SA_ constants. */
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# define SA_NOMASK SA_NODEFER
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# define SA_ONESHOT SA_RESETHAND
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# define SA_STACK SA_ONSTACK
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#endif
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/* Values for the HOW argument to `sigprocmask'. */
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#define SIG_BLOCK 1 /* Block signals. */
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#define SIG_UNBLOCK 2 /* Unblock signals. */
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#define SIG_SETMASK 3 /* Set the set of blocked signals. */
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